</div>

This means that it will **always have a value**, it's just that sometimes the value could be `None` (or `null` in JSON).

That means that, clients using your API don't have to check if the value exists or not, they can **assume the field will always be there**, but just that in some cases it will have the default value of `None`.

    <example>
      ${fe:base64(value)}
    </example>
  </function>

  <function>
    <description>
      Check if a file exists.
    </description>
    <name>fileExists</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>boolean fileExists(java.lang.String)</function-signature>
    <example>

  public TreeTraverser() {}

  /**
   * Returns a tree traverser that uses the given function to navigate from a node to its children.
   * This is useful if the function instance already exists, or so that you can supply a lambda
   * expressions. If those circumstances don't apply, you probably don't need to use this; subclass
   * {@code TreeTraverser} and implement its {@link #children} method directly.
   *

                hotThreadMonitorTask.cancel();
            }
            destroyContainer();
        }

        if (exitCode != Constants.EXIT_OK) {
            System.exit(exitCode);
        }
    }

    /**
     * Destroys the DI container and stops the timeout manager.
     * This method ensures proper cleanup of resources when the crawler shuts down.

    throw new InvalidObjectException("Use SerializedForm");
  }

  /**
   * Not supported. Use {@link #toImmutableBiMap} instead. This method exists only to hide {@link
   * ImmutableMap#toImmutableMap(Function, Function)} from consumers of {@code ImmutableBiMap}.
   *
   * @throws UnsupportedOperationException always

        if ((flags & SmbConstants.O_CREAT) == SmbConstants.O_CREAT) {
            // create it if necessary
            if ((flags & SmbConstants.O_EXCL) == SmbConstants.O_EXCL) {
                // fail if already exists
                this.openFunction = OPEN_FN_CREATE | OPEN_FN_FAIL_IF_EXISTS;
            } else {
                this.openFunction = OPEN_FN_CREATE | OPEN_FN_OPEN;
            }
        } else {

    return Float.hashCode(value);
  }

  /**
   * Compares the two specified {@code float} values using {@link Float#compare(float, float)}. You
   * may prefer to invoke that method directly; this method exists only for consistency with the
   * other utilities in this package.
   *
   * <p><b>Note:</b> this method simply delegates to the JDK method {@link Float#compare}. It is

    }

    /**
     * Deletes a character mapping item from the specified dictionary.
     * <p>
     * This method removes the specified character mapping item from the dictionary
     * if the dictionary file exists and is accessible.
     * </p>
     *
     * @param dictId the dictionary ID to delete the character mapping item from
     * @param charMappingItem the character mapping item to delete
     */

        return jobLogBhv.selectByPK(id);
    }

    /**
     * Stores a job log entry in the database.
     * Performs an insert or update operation based on whether the job log already exists.
     *
     * @param jobLog the job log to store
     */
    public void store(final JobLog jobLog) {

        jobLogBhv.insertOrUpdate(jobLog, op -> {
            op.setRefreshPolicy(Constants.TRUE);

        } catch (IOException e) {
            fail("Failed to create test certificate file: " + e.getMessage());
        } finally {
            if (invalidCertFile != null && invalidCertFile.exists()) {
                invalidCertFile.delete();
            }
        }
    }

    public void test_init_withNonExistentSSLCertificate() {